Add a getEncryptedString method in the Configuration interface

Details

Description

Hi guys,

it would be really awesome if the Configuration could be created with a passphrase (another constructor which accepts a string, let's say 'mypassphrase') and then you also add a method in the interface (let's say getEncodedString('database.password')) so we could have encoded properties in our properties files. Internally the method just needs to delegate to jasypt's StandardPBEStringEncryptor for instance